1. Dab tsi yog qhov kev sib raug zoo ntawm lub nozzle ntawm lub tshuab txhaj tshuaj thiab lub ntsiab khiav ntawm kev txhaj tshuaj pwm?
Txhawm rau kom ntseeg tau tias tsis muaj dej ntws ntawm cov neeg khiav dej num tseem ceeb thiab lub tshuab nozzle thaum txhaj tshuaj molding, uas yuav cuam tshuam rau lub demoulding. Thaum tsim cov pwm, lub ntsej muag kheej kheej nyob rau hauv qhov pib ntawm tus neeg khiav dej num tseem ceeb yuav tsum muaj lub vojvoog loj dua me ntsis ntawm lub ntsej muag kheej kheej ntawm lub taub hau ntawm lub tshuab txhaj tshuaj, raws li pom hauv daim duab 4.10, uas yog, R yog 1 ~ 2mm loj dua r. Txoj kab uas hla ntawm qhov kawg me me ntawm lub ntsiab khiav yog me ntsis loj dua li ntawm lub nozzle, uas yog, D yog 0.5 ~ 1 hli loj dua d.
2. Muaj pes tsawg daim ntawv ntawm kev txhaj tshuaj pwm thiab tshuab txhaj tshuaj?
Cov pwm txav tau thiab ruaj khov kho pwm ntawm cov pwm txhaj tshuaj yuav tsum tau muab tso rau ntawm cov pwm txav tau thiab kho pwm raws li. Muaj ob txoj hauv kev rau kev txhim kho cov pwm ntawm lub tshuab txhaj tshuaj: ib qho yog kho nws ncaj qha nrog screws; Cov ntsia hlau qhov ntawm cov pwm kho phaj thiab cov pwm ntawm lub tshuab txhaj tshuaj yuav tsum zoo ib yam nkaus. Rau cov pwm loj nrog qhov hnyav, nws muaj kev nyab xeeb dua los siv cov ntsia hlau los kho lawv ncaj qha; Lwm qhov yog tsau nrog screws thiab nias daim hlau. Tsuav yog muaj cov qhov ntsia hlau nyob ze rau sab nraud ntawm qhov tuag kho phaj qhov twg lub phaj nias yuav tsum tau muab tso, lub phaj nias tuaj yeem kho. Yog li ntawd, kev kho ntawm cov phaj nias muaj ntau dua yooj.
3. Yuav ua li cas xyuas lub tshuab txhaj tshuaj raws li qhov siab tshaj plaws txhaj tshuaj ntim?
Qhov siab tshaj plaws txhaj tshuaj yog hais txog qhov ntim siab tshaj plaws ntawm cov yas txhaj tshuaj los ntawm lub tshuab txhaj tshuaj ib zaug. Thaum tsim pwm, nws yuav tsum tau xyuas kom meej tias tag nrho cov ntim ntim yuav tsum tau rau molding yas qhov chaw yog tsawg tshaj li qhov siab tshaj plaws txhaj ntim ntawm lub tshuab txhaj tshuaj, uas yog:
—— Qhov siab tshaj plaws txhaj tshuaj tso cai los ntawm lub tshuab txhaj tshuaj, g lossis cm.
——Qhov kev siv coefficient ntawm qhov siab tshaj plaws txhaj tshuaj ntawm lub tshuab txhaj tshuaj yog feem ntau 0.8;
——Mass lossis ntim ntawm cov yas xav tau los ntawm lub rooj vag system, g lossis cm;
——Mas lossis ntim ntawm ib feem yas, g lossis cm;
—— Tus naj npawb ntawm kab noj hniav.
4. Yuav ua li cas los xyuas qhov kev txhaj tshuaj siab ntawm lub tshuab txhaj tshuaj?
Kev txhaj tshuaj siab yuav tsum tau rau cov yas molding yog txiav txim siab los ntawm cov yam ntxwv xws li hom yas, hom kev txhaj tshuaj tshuab, daim ntawv nozzle, cov duab ntawm cov khoom yas thiab lub siab poob ntawm lub rooj vag system. Rau cov yas uas muaj viscosity siab thiab cov khoom yas nrog cov duab nyias thiab cov txheej txheem ntev, kev txhaj tshuaj yuav tsum siab dua. Txij li thaum lub siab poob ntawm lub plunger hom txhaj tshuab yog ntau dua li ntawm cov ntsia hlau hom, qhov kev txhaj tshuaj yuav tsum loj dua. Kev txheeb xyuas ntawm kev txhaj tshuaj siab yog los xyuas seb qhov kev txhaj tshuaj siab ntawm lub tshuab txhaj tshuaj yog siab dua li qhov kev txhaj tshuaj siab yuav tsum tau txhaj rau molding.
5. Thaum xaiv lub tshuab txhaj tshuaj molding, yuav tsum kuaj xyuas qhov ntev li cas?
Txhawm rau txhim kho cov pwm txhaj tshuaj ntawm lub tshuab txhaj tshuaj kom zoo thiab tsim cov khoom yas tsim nyog, qhov ntev ntawm lub tshuab txhaj tshuaj thiab pwm yuav tsum tau kuaj xyuas thaum tsim pwm. Feem ntau, cov khoom uas yuav tsum tau kuaj xyuas thaum tsim pwm muaj xws li qhov loj me, qhov loj ntawm lub nplhaib qhov chaw, qhov siab tshaj plaws thiab qhov tsawg kawg nkaus thickness ntawm pwm thiab qhov loj ntawm lub qhov ntsia hlau qhov ntawm lub template.
6. Dab tsi yog yas?
Yas yog tsim los ntawm polymer hluavtaws cob raws li cov khoom siv raw, nrog rau qee yam ntawm cov khoom siv ntxiv. Nws tuaj yeem raug molded rau hauv cov khoom siv nrog qee yam qauv hauv qab qhov kub thiab txias, thiab tuaj yeem ua kom nws cov duab tsis hloov ntawm chav tsev kub.
7. Cov khoom ntawm cov yas yog dab tsi?
Plastics yog tsim los ntawm resins thiab additives (los yog additives). Resin yog cov khoom tseem ceeb, uas txiav txim siab hom (thermoplastic lossis thermosetting) thiab cov khoom siv yooj yim (xws li cov khoom siv thermal, cov khoom siv lub cev, cov khoom siv tshuaj, cov khoom siv khomob, thiab lwm yam) ntawm cov yas. Lub luag haujlwm ntawm cov khoom siv ntxiv yog txhawm rau txhim kho cov txheej txheem molding, txhim kho kev ua haujlwm ntawm cov khoom yas thiab txo cov nqi. Additives muaj xws li muab tub lim, plasticizers, colorants, lubricants, stabilizers, curing agents, thiab lwm yam
8. Raws li cov qauv molecular thiab thermal zog ntawm resins nyob rau hauv plastics, dab tsi ntawm cov yas yog cais thiab lawv cov yam ntxwv yog dab tsi?
Raws li cov qauv molecular thiab thermal zog ntawm resins nyob rau hauv plastics, yas muab faib ua ob pawg: thermoplastics thiab thermosets.
(1) Cov yam ntxwv ntawm cov thermoplastic: 1) Cov qauv molecular ntawm cov resin yog linear lossis branched saw 2) Thaum rhuab, nws yog softened thiab melted los ua cov kua dej khov. Nyob rau hauv lub xeev no, nws tuaj yeem raug molded rau hauv ib feem yas ntawm ib qho duab, thiab tom qab txias, nws tuaj yeem tswj tau cov duab ruaj khov. Yog hais tias nws yog rhuab dua, nws yuav tsum softened thiab melted dua, thiab yuav molded rau hauv yas qhov chaw ntawm ib tug tej yam zoo dua, uas yuav rov qab tau ntau zaus. 3) Hauv cov txheej txheem saum toj no, tsuas muaj kev hloov pauv ntawm lub cev thiab tsis muaj tshuaj hloov pauv.
(2) Cov yam ntxwv ntawm thermosetting plastics: 1) Cov qauv molecular ntawm cov resin yog thaum kawg lub cev qauv. 2) Thaum pib cua sov, nws cov molecules yog linear qauv, yas thiab soluble, thiab tuaj yeem molded rau hauv cov khoom yas ntawm ib qho duab. Thaum cov cua sov txuas ntxiv mus, kev sib txuas tshuaj lom neeg (xws li kev sib txuas sib txuas) yog tsim los ntawm cov saw hlau tseem ceeb ntawm cov kab hluav taws xob cov kab hluav taws xob, thiab cov molecules yog nyob rau hauv cov qauv network. Thaum qhov kub thiab txias nce mus txog ib qho nqi, qhov kev sib txuas sib txuas txuas ntxiv tsim, thiab cov molecules thaum kawg ua lub cev qauv. Cov resin yuav tsis molten los yog yaj, thiab cov duab ntawm cov yas yog tsau thiab tsis hloov. Txoj kev no hu ua curing. Yog hais tias reheated, nws yuav tsis soften thiab tsis muaj plasticity. 3) Hauv cov txheej txheem saum toj no, muaj kev hloov pauv ntawm lub cev thiab tshuaj lom neeg.
9. Cov khoom tseem ceeb ntawm cov yas yog dab tsi?
Plastics muaj ntau yam zoo heev, uas ua rau lawv siv dav hauv ntau qhov chaw. Nws lub luag haujlwm tseem ceeb suav nrog:
(1) Tsawg ntom: qhov ntom ntawm cov yas feem ntau yog 0.83 ~ 2.2g / cm3, tsuas yog 1/8 ~ 1/4 ntawm cov hlau. Qhov ntom ntawm cov yas ua npuas ncauj yog me dua, thiab nws qhov ceev yog feem ntau tsawg dua 0.01g/cm3. Qhov ntom ntawm cov yas yog me me, uas yog qhov tseem ceeb heev rau kev txo qhov hnyav ntawm cov cuab yeej siv tshuab thiab txuag lub zog, tshwj xeeb tshaj yog rau cov tsheb, nkoj, dav hlau thiab qhov chaw dav hlau.
(2) Lub zog tshwj xeeb thiab nruj nruj: lub zog ntawm cov yas tsis yog siab npaum li cov hlau, tab sis qhov ntom ntawm cov yas me me, yog li lub zog tshwj xeeb ( σ b / ρ), Cov tawv nqaij tshwj xeeb (E / ρ) Tshwj xeeb, qhov tshwj xeeb lub zog thiab qhov tshwj xeeb nruj ntawm cov yas reinforced ua los ntawm ntau lub zog muaj zog fiber ntau, flaky thiab hmoov hlau los yog cov khoom tsis yog hlau yog siab dua cov hlau.
(3) Kev ruaj ntseg tshuaj zoo: Cov yas feem ntau muaj kev tiv thaiv zoo rau cov kua qaub, alkali, ntsev, dej thiab roj. Raws li ib txwm muaj, lawv tsis hnov mob nrog cov tshuaj no.
(4) Zoo hluav taws xob rwb thaiv tsev, thermal rwb thaiv tsev thiab suab rwb thaiv tsev.
(5) Zoo hnav tsis kam thiab nws tus kheej lubricating khoom: yas muaj kev sib txhuam me me, hnav tsis kam, zoo tus kheej lubricating khoom, muaj zog tshwj xeeb thiab tsis tshua muaj suab nrov. Nws tuaj yeem ua haujlwm tau zoo nyob rau hauv cov kua nruab nrab, ib nrab qhuav lossis txawm tias qhuav qhuav. Nws tuaj yeem ua rau hauv tshuab qhov chaw xws li bearings, gears, cams thiab pulleys, thiab yog qhov tsim nyog rau lub sijhawm uas tsis tshua muaj kev ceev thiab tsis tshua muaj load.
(6) Muaj zog adhesion.
(7) Zoo molding thiab xim zoo.
10. Dab tsi yog qhov kev coj cwj pwm thaum lub sij hawm molding?
Txoj kev coj tus cwj pwm ntawm cov yas yog qhov tshwm sim uas cov saw hlau molecular polymer zoo li yuav tsum tau teem rau tib lub sijhawm raws li kev coj ua ntawm kev ntxhov siab nyob rau hauv qhov kev txiav txim ntawm kev ntxhov siab. Txoj kev taw qhia tuaj yeem muab faib ua ob qhov xwm txheej:
(1) Flow orientation ntawm cov khoom muab tub lim hauv kev txhaj tshuaj thiab kev txhaj tshuaj molded yas qhov chaw; (2) Flow orientation ntawm polymer molecules nyob rau hauv txhaj tshuaj thiab siab txhaj molded yas qhov chaw.